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Garmin GSD™ 26 Digital Black Box Network Sounder w/Spread Spectrum Sonar TechnologyRevolutionize Your Deep Sea Fishing with Advanced Sonar Precision Imagine pinpointing massive game fish lurking thousands of feet below the surface, with crystal clear separation that rivals shallow water scans. That's the game changing power of spread spectrum sonar in this digital black box network sounder. Designed for dedicated offshore anglers chasing billfish, tuna, and swordfish, it delivers unmatched clarity and detail where traditional sonar
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Revolutionize Your Deep-Sea Fishing with Advanced Sonar Precision

Imagine pinpointing massive game fish lurking thousands of feet below the surface, with crystal-clear separation that rivals shallow-water scans. That's the game-changing power of spread spectrum sonar in this digital black box network sounder. Designed for dedicated offshore anglers chasing billfish, tuna, and swordfish, it delivers unmatched clarity and detail where traditional sonar falls short.

By sweeping across a broad range of frequencies simultaneously, it gathers more data per pulse than standard systems. This results in sharper images of fish arches, bait balls, and bottom structures—even in the deepest blue water. Anglers report seeing individual fish at depths that once looked like a blurry mess, giving you the edge to drop lines right on target.

Master Any Depth with Spread Spectrum and Fixed-Frequency Modes

Switch seamlessly between cutting-edge spread spectrum scanning and precise fixed-frequency tuning. Dial in anywhere from 25 kHz for wide-area deep scans to 210 kHz for narrow, high-resolution views of specific species. Pair it with a powerful transducer, and crank transmit power up to 3,000 watts for penetrating returns from up to 10,000 feet down.

This flexibility shines during those epic all-day battles. Use low frequencies to scout vast canyons for structure-hugging predators, then zoom in high for marking fast-moving pelagics in the water column. It's like having a customizable sonar brain that adapts to your fishing style and conditions.

Dual-Transceiver Power: Run Two Setups at Once

The dual-transceiver architecture lets you operate two transducers independently and simultaneously. Run a low-frequency cone for bottom hunting alongside a high-frequency setup for mid-water pelagics—no compromises. Connect it effortlessly to your Garmin Marine Network, and view it all on multiple chartplotter screens for team coordination during big-game pursuits.

Offshore pros love this for multi-depth strategies: one channel tracks the bottom for wrecks and drop-offs, while the other hones in on surface runners. It's the ultimate setup for tournaments or when every second counts.

Rugged Build for Harsh Marine Environments

Built tough with an aluminum and steel housing plus a durable plastic access panel, it shrugs off saltwater spray and rough seas. Fully waterproof to IPX7 standards, it handles submersion and operates reliably from 5°F to 158°F. Compact at roughly 14.7 inches wide by 10.8 inches long by 3.9 inches deep, and weighing about 11.25 pounds, it tucks neatly into tight console spaces.

Power it with 10-35V DC input, and it's ready for extended trips on center consoles, sportfishers, or yachts. Vibration-resistant mounting hardware ensures stability even in heavy swells.

Easy Network Integration and What's Included

Plug into your Garmin ecosystem via the included marine network cable for shared data across displays. A software update SD card keeps firmware current for peak performance. Power cable and mounting hardware round out the kit, so you're fishing sooner.

Transducer sold separately—opt for broadband models from trusted brands to unlock full spread spectrum potential. Quick setup means more time on the water, less in the shop.

Why Serious Anglers Swear by This Sonar Module

For bluewater veterans, it's not just about seeing fish—it's about confidently making the drop shot or live bait toss that hooks your PB. Superior noise rejection cuts through thermoclines and interference, revealing thermocline shadows and suspended schools others miss. In competitive scenes, that intel translates to more releases and bigger checks.

Whether trolling spreads for marlin or drifting for yellowfin, this black box elevates your electronics stack, blending raw power with smart processing for results that demand attention.

Frequently Asked Questions

The GSD 26 digital sonar ushers in the next evolution of sport fishing technology, providing unrivaled target separation at far greater depths than traditional sonar. For serious deep-sea sport fishing, the GSD 26 takes high-definition targeting to a whole new level. With a compatible transducer, the GSD 26’s Spread Spectrum technology scans on multiple frequencies at one time, returning vast amounts of data to the receiver. As a result, you can expect precise, shallow-water-like target separation at much greater depths – up to 10,000 Feet. A traditional fixed frequency mode allows you to manually adjust frequencies from 25 Kilo Hertz to 250 Kilo Hertz for enhanced targeting of specific fish species. You can also adjust transmit power from 300 Watt to 3 kilo Watt for even more control over your sonar returns.

Garmin 100095800 Attributes

  • Size: 10.8 Inch Length X 14.7 Inch Width X 3.9 Inch Depth
  • Frequency: 25 To 250 kHz
  • Input Voltage: 10 To 35 Volt
  • Temperature Range: 5 Degree Fahrenheit To 158 Degree Fahrenheit
  • Material: Aluminum And Steel Housing With Plastic Panel
  • Waterproof: IPX7 Rating Waterproof
  • Includes: With Power Cable/ Marine Network Cable/ Software Update SD Card

Garmin 100095800 Features & Benefits

  • 26 Digital Sonar Ushers In The Next Evolution Of Sport Fishing Technology, Providing Unrivaled Target Separation At Far Greater Depths Than Traditional Sonar
  • For Serious Deep-Sea Sport Fishing, The GSD 26 Takes High-Definition Targeting To A Whole New Level
  • Traditional Fixed Frequency Mode Allows You To Manually Adjust Frequencies From 25 Kilo Hertz To 250 Kilo Hertz For Enhanced Targeting Of Specific Fish Species
  • Dual-Transceiver Design Allows For Simultaneous And Independent Transducer Operation
  • Water Rating: IPX7
  • Limited 2 Year Warranty

Garmin 100095800 Installation Instructions

Garmin 100095800 Warranties

Garmin 100095800 Technical Bulletins


GSD™ 26
Digital Black Box Network Sounder with Spread Spectrum Sonar Technology

Garmin International is pleased to announce the GSD 26 digital remote network sounder. For serious deep-water sport fishermen, this no excuses remote marine sonar takes high-definition game fish targeting to a whole new level. Designed for the most demanding sport fishing applications, the GSD 26 uses the latest in digital Spread Spectrum technologies to offer significantly better target definition, bottom contours and signal noise suppression at greater depths than traditional sonar. Instead of using a single frequency like traditional sonar, spread spectrum sweeps each pulse through a range of frequencies to deliver much more detail with unprecedented resolution and target separation in shallow and deep water. Fishermen can manually adjust frequencies on the GSD 26 - from a very low 25 kHz to a high of 210 kHz - making it easy to fine-tune the targeting of those trophy-size game fish. In addition, the GSD 26's dual-transceivers allow for simultaneous and independent transducer operation, which allows complete customization for the serious sport fisherman. Compatible with Airmar's newest line of broadband transducers, the GSD 26 offers selectable transmit power from 300 to 3,000 watts. It can scan as deep as 3,000 meters (nearly 10,000 feet). And it's designed to interface with the Garmin Marine Network. for viewing on the latest GPSMAPR 4000/5000 and 6000/7000 series chartplotter/MFDs. The Garmin spread-spectrum GSD 26 - For anglers who demand the very best.

Product Features and Specifications
  • Digital spread-spectrum sonar technology - allowing for more energy on targets resulting in even deeper performance and superior target separation
  • Manually adjustable frequencies from a very low 25kHz, to a high of 210kHz
  • Selectable transmit power from 300W to 3kW
  • Two sonar units in one - Dual-transceivers allow for simultaneous and independent transducer operation
  • Offers traditional sonar mode using discreet frequencies and Spread Spectrum mode
  • Compatible with Airmar's new line of broadband transducers (please note: limited compatibility with fixed frequency transducers)
  • Dimensions: 14.28" L x 10.79" W x 3.97" H (36.26 x 27.40 x 10.08 cm)
  • Weight: 11.25 lbs (5.1 kg)
  • Waterproof IPX 6 standards


The GSD 26 digital sonar leads the new development of sports fishing technology. Compared with traditional sonar, it provides unparalleled separation of targets at a greater depth. Discovering a clear spectrum For serious deep-sea fishing, GSD 26 takes the high-definition target to a whole new level. Use a compatible sensor, GSD 26? The spread spectrum technology of s can scan multiple frequencies at a time, thereby returning a large amount of data to the receiver. Therefore, you can expect accurate shallow-water target separation at depths greater than 10,000 feet (3,000 m). The traditional fixed frequency mode allows you to manually adjust the frequency from 25 kHz to 210 kHz to enhance the pertinence of specific fish. You can also adjust the transmit power from 300 W to 3 kW (depending on the transducer) to further control the sonar return. The dual transceiver design of the 2-in-1 Sonar GSD 26 allows the sensors to operate independently at the same time. You have full control over the data you see on a compatible Garmin chartplotter, and you can easily connect it to GSD 26 via the Garmin Marine Network.
SKU: NVN-41204
MPN: 010-00958-00
UPC: 753759969738

Garmin GSD™ 26 Digital Black Box Network Sounder w/Spread Spectrum Sonar Technology

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